Low Temperature Scanning Tunneling Microscope Studies of Magnetic Nanostructures

这个凝聚态物理项目将使用超高真空低温扫描隧道显微镜（STM）研究磁性纳米结构的性质。STM将用于探测单个磁性原子的局部电子结构，以及在干净、特征良好的金属表面上原子制造的磁性纳米结构。STM光谱将探测导电电子相互作用与过渡金属吸附物局域d能级之间的相互作用。这种相互作用决定了单个杂质原子的磁性，也导致了协同电子行为，正如在近藤效应中看到的那样。在电子行为的趋势将研究不同的吸附原子从3d， 4d和5d行元素周期表。研究了温度变化和外加磁场的影响。原子操纵将被用来改变磁性吸附物原子之间的间距，也可以一个原子一个原子地组装磁性纳米结构。我们还将努力使用非弹性隧道光谱作为人工制造纳米结构磁激发光谱的探针。这项工作将为几个关于磁性纳米结构的理论预测提供实验测试。该研究为本科生、研究生和博士后在基础和技术领域提供了良好的培训。对单个原子的操纵是当前材料科学的前沿之一。这个凝聚态物理项目的目的是更好地理解表面磁性纳米结构的行为。磁性表面和界面现象目前在数据存储行业中有着重要的应用，对微观磁性行为的理解的增加将影响这一应用和其他应用。本研究将利用超高真空低温扫描隧道显微镜（STM）研究磁性纳米结构的性质。该仪器将用于探测单个磁性原子的局部电子结构，以及在干净、特征良好的金属表面上原子制造的磁性纳米结构。原子操纵将被用来改变磁性吸附物原子之间的间距，也可以一个原子一个原子地组装磁性纳米结构。原子操纵提供了一种全新的方法，可以控制测量磁性原子之间的相互作用效应，并有望在原子尺度磁性物体的实验研究中开辟一个新的领域。我们还将努力使用非弹性隧道光谱作为人工制造纳米结构磁激发光谱的探针。从这个项目中获得的基础知识将为在纳米尺度上控制凝聚态系统的电子和磁性提供有用的一步。这项研究的结果也应该有助于理解其性质取决于组成纳米结构（如颗粒磁性材料）的更大规模系统。该研究为本科生、研究生和博士后在基础和技术领域提供了良好的培训。对单个原子的操纵是当前材料科学的前沿之一。＊＊＊

9971690CrommieThis Condensed Matter Physics project will study the properties of magnetic nanostructures using an ultra-high vacuum cryogenic scanning tunneling microscope (STM). The STM will be used to probe the local electronic structure of individual magnetic atoms and atomically fabricated magnetic nanostructures on clean, well-characterized metal surfaces. STM spectroscopy will probe the interaction between conduction electrons interact and the localized d-levels of transition metal adsorbates. Such interactions determine the magnetism of individual impurity atoms, and also lead to cooperative electronic behavior, as seen in the Kondo effect. Trends in electronic behavior will be studied for different adsorbate atoms from the 3d, 4d, and 5d rows of the periodic table. The effects of temperature variation and an applied magnetic field will be investigated. Atomic manipulation will be used to vary the spacing between magnetic adsorbate atoms and also to assemble magnetic nanostructures atom by atom. Efforts will also be made to use inelastic tunneling spectroscopy as a probe of the magnetic excitation spectra of artificially fabricated nanostructures. The work will provide an experimental test of several theoretical predictions concerning magnetic nanostructures. The research provides excellent training for undergraduate, graduate and post-doctoral students in areas of both fundamental and technological significance. The manipulation of individual atoms is one of the current frontiers in materials science. %%%The purpose of this Condensed Matter Physics project is to gain a better understanding of the behavior of magnetic nanostructures at surfaces. Magnetic surface and interface phenomena currently have important applications in the data storage industry, and an increased understanding of microscopic magnetic behavior should impact this and other applications. The research will study the properties of magnetic nanostructures using an ultra-high vacuum cryogenic scanning tunneling microscope (STM). This instrument will be used to probe the local electronic structure of individual magnetic atoms and atomically fabricated magnetic nanostructures on clean, well-characterized metal surfaces. Atomic manipulation will be used to vary the spacing between magnetic adsorbate atoms and also to assemble magnetic nanostructures atom by atom. Atomic manipulation allows a fundamentally new way of controllably measuring interaction effects between magnetic atoms, and promises to open a new regime in the experimental study of atomic-scale magnetic objects. Efforts will also be made to use inelastic tunneling spectroscopy as a probe of the magnetic excitation spectra of artificially fabricated nanostructures. The fundamental knowledge gained from this project should provide a useful step toward the goal of controlling the electronic and magnetic properties of condensed matter systems at the nanometer lengthscale. Results from this study should also be helpful in understanding larger-scale systems whose properties depend on constituent nanostructures (such as granular magnetic materials). The research provides excellent training for undergraduate, graduate and post-doctoral students in areas of both fundamental and technological significance. The manipulation of individual atoms is one of the current frontiers in materials science. ***